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參數(shù)資料
| 型號： | TC170COERT |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 85K |
| 代理商： | TC170COERT |
6
CMOS CURRENT MODE
PWM CONTROLLER
TC170
TC170-5 10/7/99
2001 Microchip Technology Inc.
DS21395A
4
3
3.15 CURRENT–
SENSE AMPLIFIER
TC170
VS
N1
I S
VS =
IS RS
N
×
+
–
+
–
Figure 5.
External Clock Synchronization
Figure 4.
Master/Slave Parallel Operation
Figure 3
Transformer Isolated Current Sense
Undervoltage Lockout
The undervoltage lockout circuit forces the TC170 out-
puts OFF (low) if the supply voltage is below 7.7V. Threshold
hysteresis is 0.75V and guarantees clean, jitter-free turn-on
and turnoff points. The hysteresis also reduces capacitive
filtering requirements at the PWM controller supply input
(pin 15).
Circuit Synchronization
Current-mode-controlled power supplies can be oper-
ated in parallel with a common load. Paralleled converters
will equally share the load current. Voltage-mode control-
lers unequally share the load current, decreasing system
reliability.
Two or more TC170 controllers can be slaved to-
gether for parallel operation. Circuits can operate from a
master TC170 internal oscillator with an external driver
(Figure 4). Devices can also be slaved to an external
oscillator (Figure 5). Disable internal slave device oscilla-
tors by grounding pin 8. Slave controllers derive an oscilla-
tor from the bidirectional synchronization output signal at
pin 10.
Pin 10 is bidirectional in that it is intended to be both a
sync output and input. This is accomplished by making the
output driver "weak." This is advantageous in that it elimi-
nates an additional pin from the package but does not
enable the device to directly drive another device. In order
to make it an effective driver, a buffer is required (Figure 4).
In order to use pin 10 as a sync input, it is necessary to
overcome the internal driver. This requires a pulse with an
amplitude equal to VIN. Since VIN must be above 8.25V for
the undervoltage lockout to be disabled, a CMOS or open-
collector TTL driver should be used.
MASTER
RO
SYNC
CMPTR
SLAVE
9
8
9
8
210
7
1/2 TC4427
VDD
TC170
10
CO
VREF
CO
RO
CMPTR
SYNC
TC170
1/2
TC4427
TC170
SYNC
EXTERNAL*
OSCILLATOR
CO
29
10
15
8
10
VS
+
VDD
*PULSE WIDTH OF
OSCILLATOR IS = TD
CO
VREF
RO
VREF
VIN
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| TC170CPE | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:CMOS CURRENT MODE PWM CONTROLLER |
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| TC170EI6 | 功能描述:COVER RCWAY TC170 LG IVR 6' RoHS:否 類別:線纜，導線 - 管理 >> 線槽，走線系統(tǒng) - 附件 系列:Pan-Way™ 標準包裝:1 系列:PANDUCT® 附件類型:蓋 - 線管 適用于相關(guān)產(chǎn)品:Panduit 導管 H 型 高度:- 寬:4"（101.6mm） 長度:36.0"（914.4mm） 顏色:黑 其它名稱:298-HC4BL36 |
| TC170EI8 | 功能描述:COVER RCWAY TC170 LG IVR(8=8') RoHS:否 類別:線纜，導線 - 管理 >> 線槽，走線系統(tǒng) - 附件 系列:Pan-Way™ 標準包裝:1 系列:PANDUCT® 附件類型:蓋 - 線管 適用于相關(guān)產(chǎn)品:Panduit 導管 H 型 高度:- 寬:4"（101.6mm） 長度:36.0"（914.4mm） 顏色:黑 其它名稱:298-HC4BL36 |
| TC170IG10 | 功能描述:COVER RCWAY TC170 LG GY10' RoHS:否 類別:線纜，導線 - 管理 >> 線槽，走線系統(tǒng) - 附件 系列:Pan-Way™ 標準包裝:1 系列:PANDUCT® 附件類型:蓋 - 線管 適用于相關(guān)產(chǎn)品:Panduit 導管 H 型 高度:- 寬:4"（101.6mm） 長度:36.0"（914.4mm） 顏色:黑 其它名稱:298-HC4BL36 |
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